linux-kernel - Re: [PATCH 2/7] iommu/omap: omap_iommu_attach() should return ENODEV, not NULL

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Date:	Mon, 23 Dec 2013 12:45:26 -0600
From:	"Anna, Suman" <s-anna@...com>
To:	Florian Vaussard <florian.vaussard@...l.ch>,
	Joerg Roedel <joro@...tes.org>,
	Tony Lindgren <tony@...mide.com>,
	Benoît Cousson <bcousson@...libre.com>
CC:	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	Grant Likely <grant.likely@...aro.org>,
	Hiroshi Doyu <hdoyu@...dia.com>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/7] iommu/omap: omap_iommu_attach() should return ENODEV,
 not NULL

On 12/17/2013 06:53 AM, Florian Vaussard wrote:
> omap_iommu_attach() returns NULL or ERR_PTR in case of error, but
> omap_iommu_attach_dev() only checks for IS_ERR. Thus a NULL return value (in
> case driver_find_device fails) will cause the kernel to panic when
> omap_iommu_attach_dev() dereferences the pointer.
>
> In such case, omap_iommu_attach() should return ENODEV, not NULL.
>
> Signed-off-by: Florian Vaussard <florian.vaussard@...l.ch>

Acked-by: Suman Anna <s-anna@...com>

> ---
>   drivers/iommu/omap-iommu.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
> index ee83bcc..385bf5e 100644
> --- a/drivers/iommu/omap-iommu.c
> +++ b/drivers/iommu/omap-iommu.c
> @@ -863,7 +863,7 @@ static int device_match_by_alias(struct device *dev, void *data)
>    **/
>   static struct omap_iommu *omap_iommu_attach(const char *name, u32 *iopgd)
>   {
> -	int err = -ENOMEM;
> +	int err = -ENODEV;
>   	struct device *dev;
>   	struct omap_iommu *obj;
>
> @@ -871,7 +871,7 @@ static struct omap_iommu *omap_iommu_attach(const char *name, u32 *iopgd)
>   				(void *)name,
>   				device_match_by_alias);
>   	if (!dev)
> -		return NULL;
> +		return ERR_PTR(err);
>
>   	obj = to_iommu(dev);
>
>

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